On the rigidity, note that the carbon plate is longer.
And the videos of Patrice pumping it on the flat with his 105kg does not show a lot of flex...
Both his feet are on the carbon plate.

You may see a tiny bit of flex in the front, out of the carbon plate span when the nose touches the water, but it should not significantly impact performance
www.instagram.com/p/Cstw_5JoA9Y/www.instagram.com/patrice_guenole/Note: Gong pre-announces (i.e. teases) things first on Instagram and Facebook, before mentioning it on the forum and then the web site.
Think of Instagram and FB as alpha test, forum beta test and website release :-)